I feel like this should be a common request, but I cannot find any posts or examples that are exactly as I am looking for. We need a report that will group based on one column with a plus sign. Clicking the plus sign will expand and show the rows for that groups populating the rest of the columns. This is a standard set up we use in our current reporting solution (SSRS) but we are trying to switch everything to Telerik.I have gotten close to this result in Telerik, but still have the first row of additional data showing in the collapsed group row, which is incorrect.
Example of what we are looking for: